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OK. I dont know how many times Ive given people advice on getting their battery load tested and they tell me its fine. Then later on tellme I was right. I'lltrust you on it.
Do this..............
Find the starter relay. Verify this. One pin should be 12V direct to battery, one pin should be chassis ground. One pin should go directly to the starter solenoid. The last pin should be the signal form the PCM. Find a really thin wire ( like telephone wire ) and wrap it around the pin and insert it back into the socket it goes to.
Now use your DMM to see what you get when you go to crank the car.
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The battery is fine and I've also tried jumping it. Unfortunately the schematic In my manual doesn't match what the car actually has on it
. Heck even the fuse box layout is different! Stupid schematics for different model years.
OK. I dont know how many times Ive given people advice on getting their battery load tested and they tell me its fine. Then later on tellme I was right. I'lltrust you on it.
Do this..............
Find the starter relay. Verify this. One pin should be 12V direct to battery, one pin should be chassis ground. One pin should go directly to the starter solenoid. The last pin should be the signal form the PCM. Find a really thin wire ( like telephone wire ) and wrap it around the pin and insert it back into the socket it goes to.
Now use your DMM to see what you get when you go to crank the car.
I checked the wiring diagram and the PCM is merely to finish the path to ground. However read the testing that I did today:
Because I have read of so many people with similar issues I am going to try to detail everything I have done quite thoroughly. For those that might be trying to track down a similar issue I discovered that Auto Zone has wiring diagrams listed out by year - this has proved very invaluable to my testing process.
Because it will not crank over I decided to focus on the starting system:
- Power to the ignition cylinder/switch- Checks out ok
- Power to the green starter relay (relay 7) in the engine compartment - check
- relay is not switching
- relay switches when manually grounded / Car cranks but does not start (even with starter fluid)
- issue is downstream of this point
- Neutral/Park gear sensor
- Wiring to PCM from previous sensor
- PCM
- Manually ground PCM side of Neutral/Park gear sensor - Car cranks but does not start (even with starter fluid)
**This leads me to believe the PCM is faulty or the PATS system is malfunctioning
Did some swapping/comparing to my rusted out but running '98 donor car
- Swapped ignition antenna ring - Checks out ok
- Swapped the ignition switch (electrical portion) - Checks out ok
I also hooked my computer with my Ford ScanTool program up to the car and it will not communicate with it at all. The program communicates with the '98 donor car without any issues. It also gave me hope if I can get them to communicate because there is a key programming option in the ScanTool software.
**Again this leads me to PCM being faulty and causing it not to communicate**
I was going to try swapping the PCM from the two cars but my donor is a '98 with a return style system and the car I am working on is a '99 with returnless. Can someone tell me if it will at least make it run? I know the timing curves/transmission stuff might be a little different but if I can prove the PCM is bad I would feel alot better spending the $$$ on the correct one.
- Donor '98 is a 98BB-12A650-BZA (Code AZB0)
- Current '99 is a XS2A-12A650-GD (Code LXP3)
Another thing I noticed is that something is flowing/using electricity all the time (PCM?) as the ground post will spark slightly when I hook it up to the battery (all doors closed, lights and ignition off). After watching some youtube videos this may be normal?
Also the fuel pump has no power (purple+orange) to it with the key off after hooking up the battery but if you cycle the key on, then off again the fuel pump still has power.
In short I'm thinking that either the key is bad and therefore keeping the ScanTool program from talking to the PCM or the PCM itself is bad. Any more advice is appreciated.